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Re:Building a Web Application that makes $500 a Month – Part II by mootothemax on Wednesday April 27, 2011 @06:00PM (#2491272)
It's really difficult, I find, to come up with something that hasn't already been done before

There were plenty of Twitter tools that'd let you schedule tweets before TweetingMachine was developed. If you have competition, it means there's money in that space :)

Re:Building a Web Application that makes $500 a Month – Part II by andrewcanis on Wednesday April 27, 2011 @10:01PM (#2491810)
This is really good to know. I always seem to come up with ideas that have already been done. But it's possible my new approach would be better than the competition, like TweetingMachine.